General: Annual herb from a taproot; stems erect, several, more or less hairy, branched, 20-50 cm tall.
Leaves: Stem leaves 2-3 times pinnately cut, 7-20 cm long, including the 2-8 cm stalks; leaflets lanceolate to egg-shaped; upper stem leaves usually 1-pinnate.
Flowers: Inflorescence of several compound umbels; the several spokes with a single bract; flowers white.
Fruits: Oblong egg-shaped, 3-4 mm long, covered with bristles, also with inconspicuous, translucent, appressed spines in lines; beaks not prominent.